Facile, one-pot synthesis was developed for several β(1→2)-, β(1→3)- or β(1→4)-linked disaccharides from fully unprotected methyl hexopyranosides according to the molecular recognition by arylboronic acids. The methodology was successfully applied to facile, short step assembly of the trisaccharide fragment of type II arabinogalactan.
Regioselectivity shift from β-(1→6)- to β-(1→3)-glycosylation of non-protected methyl β-d-galactopyranosides using the stannylene activation method
作者:Eisuke Kaji、Keigo Shibayama、Kazusada In
DOI:10.1016/s0040-4039(03)01095-5
日期:2003.6
Regio- and stereoselective glycosylation of non-protected methyl β-d-galactopyranoside has been developed using the stannylene acetal mediator, allowing a one-pot assembly of glucosyl-β-(1→6)-galactose and glucosyl-β-(1→3)-galactose. Remarkable regioselectivity shift from β-(1→6)- to β-(1→3)-glycosylation has been observed by addition of Bu4NF etc. to the reaction medium. The method requires no tedious